# cimagf, cimag, cimagl

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< c‎ | numeric‎ | complex

Defined in header ``<complex.h>`` |  |
float cimagf( float complex z ); | (1) | (since C99)
double cimag( double complex z ); | (2) | (since C99)
long double cimagl( long double complex z ); | (3) | (since C99)
Defined in header ``<tgmath.h>`` |  |
#define cimag( z ) | (4) | (since C99)

1-3) Returns the imaginary part of `z`.
4) Type-generic macro: if `z` has type long double complex, long double imaginary, or long double, `cimagl` is called. If `z` has type float complex, float imaginary, or float, `cimagf` is called. If `z` has type double complex, double imaginary, double, or any integer type, `cimag` is called.

### Parameters

z | - | complex argument

### Return value

The imaginary part of `z`.

This function is fully specified for all possible inputs and is not subject to any errors described in math_errhandling

### Notes

For any complex variable `z`, z == creal(z) + I*cimag(z).

### Example

Run this code

    #include <stdio.h>
    #include <complex.h>

    int main(void)
    {
        double complex z = 1.0 + 2.0*I;
        printf("%f%+fi\n", creal(z), cimag(z));
    }

Output:

    1.000000+2.000000i

### References

- C11 standard (ISO/IEC 9899:2011):

  - 7.3.9.2 The cimag functions (p: 197)

  - 7.25 Type-generic math <tgmath.h> (p: 373-375)

  - G.7 Type-generic math <tgmath.h> (p: 545)

- C99 standard (ISO/IEC 9899:1999):

  - 7.3.9.2 The cimag functions (p: 178-179)

  - 7.22 Type-generic math <tgmath.h> (p: 335-337)

  - G.7 Type-generic math <tgmath.h> (p: 480)

### See also

crealcrealfcreall (C99)(C99)(C99) | computes the real part of a complex number (function)
C++ documentation for imag

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